// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_RENDERER_PEPPER_PPB_GRAPHICS_3D_IMPL_H_
#define CONTENT_RENDERER_PEPPER_PPB_GRAPHICS_3D_IMPL_H_

#include <stdint.h>

#include <memory>

#include "base/macros.h"
#include "base/memory/shared_memory.h"
#include "base/memory/weak_ptr.h"
#include "gpu/command_buffer/client/gpu_control_client.h"
#include "gpu/command_buffer/common/command_buffer_id.h"
#include "gpu/command_buffer/common/mailbox.h"
#include "gpu/command_buffer/common/sync_token.h"
#include "ppapi/shared_impl/ppb_graphics_3d_shared.h"
#include "ppapi/shared_impl/resource.h"

namespace gpu {
namespace gles2 {
    struct ContextCreationAttribHelper;
}
struct Capabilities;
class CommandBufferProxyImpl;
}

namespace content {

class PPB_Graphics3D_Impl : public ppapi::PPB_Graphics3D_Shared,
                            public gpu::GpuControlClient {
public:
    static PP_Resource CreateRaw(
        PP_Instance instance,
        PP_Resource share_context,
        const gpu::gles2::ContextCreationAttribHelper& attrib_helper,
        gpu::Capabilities* capabilities,
        base::SharedMemoryHandle* shared_state_handle,
        gpu::CommandBufferId* command_buffer_id);

    // PPB_Graphics3D_API trusted implementation.
    PP_Bool SetGetBuffer(int32_t transfer_buffer_id) override;
    scoped_refptr<gpu::Buffer> CreateTransferBuffer(uint32_t size,
        int32_t* id) override;
    PP_Bool DestroyTransferBuffer(int32_t id) override;
    PP_Bool Flush(int32_t put_offset) override;
    gpu::CommandBuffer::State WaitForTokenInRange(int32_t start,
        int32_t end) override;
    gpu::CommandBuffer::State WaitForGetOffsetInRange(int32_t start,
        int32_t end) override;
    void EnsureWorkVisible() override;
    void TakeFrontBuffer() override;
    void ReturnFrontBuffer(const gpu::Mailbox& mailbox,
        const gpu::SyncToken& sync_token,
        bool is_lost);

    // Binds/unbinds the graphics of this context with the associated instance.
    // Returns true if binding/unbinding is successful.
    bool BindToInstance(bool bind);

    // Returns true if the backing texture is always opaque.
    bool IsOpaque();

    // Notifications about the view's progress painting.  See PluginInstance.
    // These messages are used to send Flush callbacks to the plugin.
    void ViewInitiatedPaint();

    gpu::CommandBufferProxyImpl* GetCommandBufferProxy();

protected:
    ~PPB_Graphics3D_Impl() override;
    // ppapi::PPB_Graphics3D_Shared overrides.
    gpu::CommandBuffer* GetCommandBuffer() override;
    gpu::GpuControl* GetGpuControl() override;
    int32_t DoSwapBuffers(const gpu::SyncToken& sync_token,
        const gfx::Size& size) override;

private:
    explicit PPB_Graphics3D_Impl(PP_Instance instance);

    bool InitRaw(PPB_Graphics3D_API* share_context,
        const gpu::gles2::ContextCreationAttribHelper& requested_attribs,
        gpu::Capabilities* capabilities,
        base::SharedMemoryHandle* shared_state_handle,
        gpu::CommandBufferId* command_buffer_id);

    // GpuControlClient implementation.
    void OnGpuControlLostContext() final;
    void OnGpuControlLostContextMaybeReentrant() final;
    void OnGpuControlErrorMessage(const char* msg, int id) final;

    // Other notifications from the GPU process.
    void OnSwapBuffers();
    // Notifications sent to plugin.
    void SendContextLost();

    // Reuses a mailbox if one is available, otherwise makes a new one.
    gpu::Mailbox GenerateMailbox();

    // A front buffer that was recently taken from the command buffer. This should
    // be immediately consumed by DoSwapBuffers().
    gpu::Mailbox taken_front_buffer_;

    // Mailboxes that are no longer in use.
    std::vector<gpu::Mailbox> mailboxes_to_reuse_;

    // True if context is bound to instance.
    bool bound_to_instance_;
    // True when waiting for compositor to commit our backing texture.
    bool commit_pending_;

#if DCHECK_IS_ON()
    bool lost_context_ = false;
#endif

    bool has_alpha_;
    const bool use_image_chromium_;
    std::unique_ptr<gpu::CommandBufferProxyImpl> command_buffer_;

    base::WeakPtrFactory<PPB_Graphics3D_Impl> weak_ptr_factory_;

    DISALLOW_COPY_AND_ASSIGN(PPB_Graphics3D_Impl);
};

} // namespace content

#endif // CONTENT_RENDERER_PEPPER_PPB_GRAPHICS_3D_IMPL_H_
